Kilter,
The Napoleon mirrors thread on. You have to cut off a small tube to get them to put, but that was easy. I retained my stock barends, and used the bolts from the stock barends to hold the mirrors. I also used some Locktite to keep them from coming off. The bolts that come with the mirrors aren't long enough to use the stock barends. The stock bolts work, they just don't thread in real far. I haven't had any problems with this setup yet.
I like the Rizomas, but not the price.
Thanks for the compliments.